Khusaylah bint Wathilah (may Allah have mercy on her) said: I heard my father say: I heard the Prophet (peace and blessings be upon him) say: "Among the very greatest of the major sins is that a man disowns (the lineage of) his own child."
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18458